42     Tincture  of  ^illaia  as  an  Emulsifying  Agent.  \^'^']°r,'I%o'^'^' 
preparation  I  mean  is  the  Linimentum  Hydrargyria  which  Squire  says 
"should  be  a  lead-colored  cream,  but  is  curds-and-whey."  By  using, 
tinct.  quillaiae  a  lead-colored  cream  may  be  formed  which  does  not  turi> 
to  curds-and-whey.  The  preparation  here  contains  the  same  propor- 
tion of  active  ingredients  as  is  ordered  in  the  Pharmacopoeia.  If  left 
undisturbed  for  some  time,  the  ung.  hydrargyri  settles  to  the  bottom, 
but  a  vigorous  shaking  blends  it  again  perfectly.  The  following  is  the 
formula: 
Lin.  camph.,  .  .  -  .  '5' 
Tinct.  quillaiae,  ....  ^iii 
(Liq.  amm.  fort.,  o'i      40>  ^9-  ^^1),       .  .  .  3v 
Ung.  hydrarg.,  .  .  .  .  i  oz. 
Chloroform  is  made  into  an  excellent  emulsion  by  means  of  this 
tincture. 
Chloroform,  .....  Tr\^x 
Tinct.  quillaiae,  .  .  .  . 
Aq.  destil.,  .  .  .  .  ad  5i 
Misce. 
Although  chloroform  is  such  a  heavy  liquid,  yet  it  remains  suspended 
for  some  minutes  after  shaking;  it  finally  settles  as  a  creamy  layer  at 
the  bottom  of  the  bottle.  A  solution  of  saponin  m  water,  shaken  with 
chloroform,  converts  it  into  a  thick  creamy  fluid;  the  water  separates^ 
but  the  chloroform  permanently  retains  its  creamy  character. 
Here  is  a  mixture  of  castor  oil,  made  according  to  the  following; 
formula: 
Ol.  ricini,  .....  ^ss 
Tinct.  quillaiae,  .... 
Aq.,       .  .  .  .  .  ad  gi 
The  tincture  is  first  put  into  the  bottle,  afterwards  the  oil,  and 
shaken  together,  then  the  water  is  added  and  again  shaken.  The 
emulsion  thus  formed  resembles  its  prototype  milk  in  appearance,  and 
like  it  separates  after  the  lapse  of  some  time  into  a  cream  at  the  top, 
which  mixes  again  upon  agitation.  Emulsions  prepared  in  a  similar 
manner  of  oleum  morrhuae  and  oleum  olivre  are  of  as  perfect  a  char- 
acter. 
Ext.  filicis  liquid.,  .  .  .  .  •  3i 
Tinct.  quillaiae,  ....  5ss 
Aq.  destil.,  .  .  .  .  ad  ^i 
Misce. 
V 
